Reaction of Malonic Acid Derivatives with Acetylenic Diphosphonates

The primary addition products in the reactions of malonic esters, cyanoacetic esters, and malononitrile with acetylenediphosphonates in acetonitrile in the presence of anhydrous potassium carbonate are potassium derivatives, viz. esters and nitriles of the corresponding 2-alkoxycarbonyl(or 2-cyano) -3,4-bis(di-alkoxyphosphinoyl)-2-potassiobut-3-enoic acid. Further hydrogen replacement for potassium in the nitriles is accompanied by isomerization involving double-bond shift and geometry change. (E)- and (Z)-3,4-bis(dial-koxyphosphinoyl)-2-cyano-2-potassiobut-3-enenitriles (the alkoxy groups are CH₃O and C₂H₅O) are crystalline compounds; they were isolated and characterized.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 1, 2005, pp. 11–20.Original Russian Text Copyright © 2005 by Shekhadeh, Didkovskii, Dogadina, Ionin.